Check on operation of Lambda sensor heater

Make: Fiat
Model: Bravo Factory Service Manual
Year: 2007–2014
Section: Emission control system › Check on operation of Lambda sensor heater

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EngineCheck on operation of Lambda sensor heater

Check on operation of Lambda sensor heater

Check 1080BI

1.9 JTD 8v, 1.9 JTD 16v

STEP	CHECK TO BE PERFORMED	IF THE CHECK IS NOT OK
1	WIRING CONTINUITY CHECK Turn the ignition key OFF. Connect disconnector AD-456 n° 1806590000 between the cable loom coming from the engine management control unit and the sensor Extract the relay T9 from the socket in the engine compartment junction unit Connect a shunt cable with a fuse between pin 87 of the base unit for relay T9 and the battery positive. Check that the voltage between pin 4 (wiring side) of the sensor See K040 LAMBDA SENSOR Check that the voltage between pin 4 (wiring side) of the sensor Move on to Step 3	Repair or, if necessary, replace the wiring between the engine compartment junction unit and the Lambda sensor See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT Replace the engine compartment junction unit Op. 5505A13 ADDITIONAL JUNCTION UNIT IN ENGINE COMPARTMENT - R.R.
3	WIRING CONTINUITY CHECK Disconnect the shunt connection with fuse. Disconnect the cable loom connector from the engine management control unit connector K. Check that the resistance for the wiring between pin 3 of the sensor and pin 51 of the engine management control unit is less than 1 Ohm Move on to Step 4	Repair or, if necessary, replace the wiring between the engine management control unit and the Lambda sensor See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT
4	Check the continuity of the wiring Turn the ignition key OFF. Check that the resistance between pin 3 (wiring side) of the sensor See K040 LAMBDA SENSOR and the earth is more than 500 kOhm. Move on to Step 5	Repair or, if necessary, replace the wiring between the engine management control unit and the Lambda sensor See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT
5	Check the continuity of the wiring Check that the resistance between pin 3 (wiring side) of the sensor See K040 LAMBDA SENSOR and control unit Pin 12 (wiring side) See M010 ENGINE MANAGEMENT ECU is less than 5 Ohm Move on to Step 6	Repair or, if necessary, replace the wiring between the engine management control unit and the Lambda sensor See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT
6	Heater resistance check Check that the resistance between pins 3 and 4 (wiring side) of the sensor See K040 LAMBDA SENSOR is around 3 Ohm	Replace the Lambda sensor Op. 1080B90 LAMBDA SENSOR - R.R. Replace the engine management control unit Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - R.R
7	Current adjustment resistance check Check that the resistance between pins 1 and 5 (wiring side) of the sensor See K040 LAMBDA SENSOR is between 30 and 300 Ohm	Replace the Lambda sensor Op. 1080B90 LAMBDA SENSOR - R.R. Replace the engine management control unit Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - R.R

STEP

CHECK TO BE PERFORMED

IF THE CHECK IS NOT OK

WIRING CONTINUITY CHECK

Turn the ignition key OFF.
Connect disconnector AD-456 n° 1806590000 between the cable loom coming from the engine management control unit and the sensor
Extract the relay T9 from the socket in the engine compartment junction unit
Connect a shunt cable with a fuse between pin 87 of the base unit for relay T9 and the battery positive.
Check that the voltage between pin 4 (wiring side) of the sensor

See K040 LAMBDA SENSOR

Check that the voltage between pin 4 (wiring side) of the sensor

Move on to Step 3

Repair or, if necessary, replace the wiring between the engine compartment junction unit and the Lambda sensor

See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT

Replace the engine compartment junction unit

Op. 5505A13 ADDITIONAL JUNCTION UNIT IN ENGINE COMPARTMENT - R.R.

WIRING CONTINUITY CHECK

Disconnect the shunt connection with fuse.
Disconnect the cable loom connector from the engine management control unit connector K.
Check that the resistance for the wiring between pin 3 of the sensor and pin 51 of the engine management control unit is less than 1 Ohm

Move on to Step 4

Repair or, if necessary, replace the wiring between the engine management control unit and the Lambda sensor

See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT

Check the continuity of the wiring